Erasing-shield



F. P. ZWCKER. ERASING SHIELD.

v APPLICATIO n 0cT.27,1919. 1,353,133.

Patented Sept. 14, 1920.

' FIGLI.

.INVESTOR I mul l.

UNITED STATES l 'PATENT-'OFFICE FREDERICK P. ZWICKER, F SAN FRANCISCO,CALIFORNIA, ASSIGNOR OF TWENTY- FIVE PER CENT. TO WILBUR J. RYAN ANDTWENTY-FIVE PER CENT. TO ALBERT H.- HOLADAY, BOTH OF SAN FRANCISCO,CALIFORNIA.

EaAsING-SHIELD.

Application led October 27, 1919. Serial No. 333,669.

To all whom t may concern:

Be it known that L'FREDERICK P. ZWIGKER, a citizen of the' UnitedStates, residing at the city and county of San Francisco and State ofCalifornia, have invented new and useful Improvement in Erasing-Shields,ofv

which the following is a. specification.

This invention relates to an erasing shield for typewriting machines andthe like.

One of the objects of the present inyention is to provide a simple andcheaply manuf factured erasing shield for typewriting machines which maybe easily and readily placed on the platen cylinder and inserted betweenthe sheets of the paper and the carbons, whereby erasures may be neatlymade on each sheet without smearing or blurring the other copies.

Another object of the invention is to provide supporting lmembers ateach end of the shield so as to slightly elevate it with relationto theplaten and the underlying sheets,

thereby protecting the surface and sheets below the point of erasurefromthe pressure caused by such erasure.

Another object of the invention is to provide means for rigidly securingthe shield against movement with relation to the sheets or the platenwhen in use.

Further objects will hereinafter appear.

The invention consists of the parts and the construction, combinationand arrangement of parts as hereinafter more fully described .andclaimed, having reference to the accompanying drawings, in which- Figurel is' a perspective view of the erasing shield.

Fig. 2 is a partial side elevation of a typewriter, showing the positionof the shield on the platen when in use.

Referring to the drawings in detail, A indicates in general the frame ofthe typewriter; 2, the platen; and 3, the keys.

The erasing shield forming the subject matter of the present inventionis generally shown in Fig. 1. -It consists of a curved, shield-likemember B which is adapted to extend substantially from end to end of theplaten, the curvature of the shield being substantially the same as thecontour of the laten. Formed at each end of the shield4 E are downwardlyprojecting supporting members 3, and formed on each supporting memberare serrations or teeth 4 whichv are adapted to engage the surface ofthe platen in such a manner as t0 rigidly secure it agalnst movementwith relation to the platen or the sheets when erasures are being madethereon. The shield is otherwise provided with a handle 5 projectingsub- Speciicaton of Letters Patent. Patelntdsept, 14, 19 20 I stantiallyat right angles thereto, to permit the shield to be readily handled andheld when in use. rlhe supporting members 3 formed at the ends of theshield are pro` vided for the purpose of slightly elevating the shieldwith relation to the platen and any sheets or carbons that may underliethe shield. The pressure exerted on the shield when an erasure is beingmade thereon will therefore notl be exerted upon any underlying sheetsand smudges or blurring v is therefore eliminated.

The shield is in actual practice sufiiciently I long to extendapproximately from end to end of the cylindrical platen and as the supfporting extensions or elevating members 3 are comparatively short, itcan readily be seen that the typewritten sheets and the carbonsinterposed between the same will lie between the supporting members. Theserrations 4 formed on said members will therefore not perforate any ofthe sheets as they engage that portion of the platen .which extendsbeyond the sheets.

In actual practice if a mistake is made, it is only necessary to turn upthe first sheet, as indicated at 6. The shield is then grasped by thehandle 5 and placed in the position shown in Fig. 2, where it will un--derlie sheet 6 and overlie lthe remaining carbons and copies; the lineto bev erased should, however, preferably be turned up al coupleofspaces to'permit the section being erased to be readily reached. Eachsuccessive sheet or copy may thus be erased and corrected withoutexerting pressure on the underlying sheets. Blurring of the lines orsmudges are thus eliminated and neat and clean work is the result.

The shield shown is in this instance constructed of a single piece ofsheet metal, the handle 5 and the supporting members 3 being bent intotheir respective places from said-sheet. and the main supporting surfaceB being bent to conform to the outer conf Vtour of the cylindricalplaten.

I wish it understood that while it is here shown as an integralconstruction, it is obvious that various changes in design andproportions may be resorted to Within the scope of the appended claims;similarly, that the materials and finish of the several parts Amay besuch as the experience and judgment of the manufacturer may dictate.

Having thus described my invention,

what I claim and desire to secure by Letters Patent is- J l. An'erasingshield for typewriting machines comprising a curved shield, andsupporting members at each end of the shield adapted to rest upon theplaten of the typewriting machine and to slightly elevate the shieldWith relation ,to the platen.

2. An erasing shield for typewriting machines comprising a curved shieldadaptedl to extend substantially from end to end of the platen cylinderon the machine, and means at each end of the shield adapted to engagethe platen of the typewriting machine and to slightly elevate the samewith relation to said platen. Y

3. An erasing shieldfor typewriting machines comprising a curved shield*adapted to extend substantially from end to end of v the platencylinder on the machine, and downwardly projecting supporting members ateach end of the shield, adapted to rest upon the platen near the endsthereof and to slightly elevate the shield with relation to the platen.

4. An erasing shield for typewriting machines comprising a curved shieldadapted to extend substantially from end to end of the platen cylinderon the machine, downwardly projecting supporting `members at each end ofthe shield, adapted to slightly elevate it With relation to the platen,and serrations formed on each supporting member to secure the shieldagainst movement with relation to the platen when in use.

5. An erasing shield for typewriting machines comprising a curved shieldadapted FREDERICK P. ZWICKER.

^ Witnesses:

A. K. DAGGETT, DENT CALLAGHAN.

